Start and finish is in Eschenlohe. At first you will have to go over the Zwölferkopf to the summit of the „Hohe Kiste“ which has an ascent of 1300 vertical meters. Afterwards heading towards Simetsberg and going down to Walchensee. Here another big ascent is waiting up to Herzogstand. You can have a rest at the lodge here. Now following a great ridge to Heimgarten (another hut) and after this it is going down most of the time over Rauheck to the Osterfeuerspitze and down to Eschenlohe.
This loop is about 43km and 3400 vertical meters.
Good photos and more info:

The Whites Creek Trail is a 22.5 mile lollipop loop within the Irish Wilderness. The major trailhead into the Wilderness is Camp Five Pond located off Highway J, though the spur to this trailhead is not part of the FKT route. The only spur included in the FKT route is the long one on the north end to the Brawley Pond Trailhead at County Road 163. Athletes may choose any start/finish location as long as they complete the loop and the Brawley Pond lollipop stick (out and back).

Point to point route traversing the Sylamore Ranger District in the Ozark-St Francis National Forest. Can be run Northbound from Sylamore Trailhead in Allison, AR to Matney Knob Trailhead in Norfork, AR (or) Southbound. The track utilizes the Sylamore Trail & Sylamore Extension (Blue Blazes) and the Ozark Highlands Trail-Sylamore Section (White Blazes). Approximate length of 42 miles with 6500' of climb. Challenging but gorgeous Arkansas Ozarks terrain.

Shuttle service options provided by Norfork Adventure Supply in Norfork, AR.
 

At 15km bike path (rail trail) in Suffolk County, NY.

https://www.traillink.com/trail/epcal-alternative-transportation-path/

Vertical Kilometer route up to George Peak. Start at top of Abour rd, Heatherlands, George, South Africa
This route ascends 1000m in 4km

This FKT entails summiting 6 peaks in the Witfontein Nature Reserve, near George, South Africa, and moving on foot between the various peaks from the start to the finish.

• Vensterberg - 1247m
• Losberg - 813m
• Cradock Peak - 1532m
• George Peak - 1276m
• Tierkop - 766m
• Groenkop - 606m

Distance: 42-50km - Elevation gain 3900m

https://www.facebook.com/George6PeaksFKT